Sending mail from a shared mailbox in Azure Function with System Managed Identity

Clinton van Axel 126 Reputation points
2023-12-01T09:41:19.1066667+00:00

Hello,

I have created an Azure Function App with a System Managed Identity and granted it the necessary Mail.Send API permissions. However, I am unable to send mails from a shared mailbox. The error message I receive is:

The user account which was used to submit this request does not have the right to send mail on behalf of the specified sending account., Cannot submit message.

I only have application API permission and I know that the error is showing delegated permissions, but that is not possible with an Enterprise application. Can someone guide me on how to resolve this issue?

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